Perhaps you should try some spelling variations:
sic metal » c metal
2c thesis » 2 thesis, _ thesis, a thesis
2c metal » c metal, ic metal, sc metal
27 maldi » 2 maldi, 7 maldi, _ maldi
17 maldi » 12 maldi, 16 maldi, 7 maldi

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: %22archaeology%((2c metal) OR (sic metal))lurgy%((27 maldi) OR (17 maldi))%2c thesis%_ archaeometallurgy%((2c metal) OR (sic metal))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22archaeology%((2c metal) or (sic metal))lurgy%((27 maldi) OR (17 maldi))%2c thesis%_ archaeometallurgy%((2c metal) or (sic metal))%22".
• Adding a wildcard symbol may retrieve word variants: %22archaeology%((2c metal) or (sic metal))lurgy%((27 maldi) OR (17 maldi))%2c thesis%_ archaeometallurgy%((2c metal) or (sic metal))%22*.